The two shafts connected by the coupling have no axial movement, no bending, and small dial indicator and bearing errors. The ideal two-axis alignment should be completely coaxial. Coupling alignment is performed in the cold state of the system. After the equipment has been running for a period of time, there will be a certain degree of thermal expansion, which will have a certain impact on the alignment results. Strictly speaking, only the thermal expansion of the system can be accurate. For alignment, for flange couplings, etc., because there is a certain axial gap or a certain axial variable is allowed, the axial thermal expansion has little effect on the alignment result. Similarly, the coaxiality of the two shafts It meets the requirements in the cold state, and the radial thermal expansion also has no effect on the alignment results in the cold state. Furthermore, this influence has an influence on any adjustment under cold conditions.
After the bearing is lubricated, the oil can be recycled and recycled. The oil does not form aerosol, does not pollute the environment, consumes less oil, and the flow rate is adjustable; the function of the gas is to bring out the heat generated by the rotation of the bearing at a speed to ensure that the spindle is relatively fast. Low temperature rise, high-speed operation of the spindle can be realized. This set of equipment has the advantages of oil lubrication and aerosol lubrication, so it can ensure that the spindle has low heat and temperature rise at high speeds, so that the spindle maintains good heat Stability, which helps to ensure the accuracy and machining accuracy of the spindle. At the same time, because of the low consumption of lubricating oil, it can be recycled, energy saving and environmental protection.
Loose coupling may cause uneven transmission torque, causing vibration to vary with load. There are three ways for coupling to transmit torque, bolt transmission, coupling surface friction transmission, both of which are available. Couplings belong to both transmission methods. In the transmission process, each bolt torque should be Uniform, so that during the load change, the force transmitted by each bolt increases or decreases equally. Assuming that the coupling has only two bolts tightened, and the shear force of the female bolt is equal, then there is only torque in the coupling.
If the shear forces of the two bolts are not equal, in addition to the torque, there is also a force acting on the center of the rotor, which changes with the load of the unit, so the vibration of the unit also changes as the load changes. Loose bolts will cause the position of the two halves of the wheels to change, the center of mass of the coupling will deviate, and a new additional unbalanced mass will appear, resulting in additional unbalanced force, which is manifested as a sudden rise in vibration. The misalignment of the opposite wheel changes with the load change, so the unit vibration 1 also appears as a sudden rise with the load change.
